DESCRIPTION The main body ECU (multiplex network body ECU) detects a high beam headlight illumination request signal of the automatic high beam system from the forward recognition camera.
WIRING DIAGRAM 
PROCEDURE
(a) Check the forward recognition camera system. Click here
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Toyota Tundra Service Manual > Audio And Visual System: Sound Signal Circuit between Radio Receiver and Stereo Jack Adapter
DESCRIPTION The No. 1 stereo jack adapter assembly sends an external device sound signal to the radio and display receiver assembly through this circuit. The sound signal that has been sent is amplified by the radio and display receiver assembly and then is sent to the speakers. If there is an open ...
